Currently platinum-based double chemotherapy is the standard first-line treatment for advanced non-small cell lung cancer (NSCLC).When the disease is under control,the next step after a standard course of chemotherapy is controversial,and maintenance treatment is used in the treatment of advanced NSCLC increasingly.Maintenance treatment of advanced NSCLC includes continue maintenance treatment and medication changed maintenance therapy.currently used for maintenance therapy with pemetrexed and erlotinib are shown to improve overall survival,which are usually used for maintenance treatment.
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